Data for the paper "Uncovering the birth of the Milky Way through accurate stellar ages with Gaia", accepted in Nature Astronomy

Data files used in the paper that contain information that is not available in public catalogues, and that is necessary to produce the figures. The extended dataset consists of: i) (<strong>a</strong> and <strong>b</strong> panels of figure 1): two tables directly retrieved from the Gaia archive as described in Methods, supplemented by extinction information on a star-by-star basis; the code used to interpolate the 3-D extinction maps by Lallement et al. (2018) can be retrieved from \url{https://github.com/edober/dust_maps_3d}. ii) (<strong>c</strong> and <strong>d</strong> panels of Figure 1, Figure 2 and panel <strong>a </strong>of Figure 3): two tables with the derived solution CMDs. Two files with the necessary data to define the boxes used to select stars in the blue and red sequences of the halo CMD are also included. iii) (panel <strong>b</strong> of Figure 3): necessary tables with the age, metallicity and velocity data for the main progenitor and accreted satellite for realisation g15784 of the MaGICC program (Brook et al. 2012). The complete information on the final timestep of that simulation, together with scripts to read and plot the data are also included in the extended dataset. A explanatory README is contained within the tar file.